你这个老滑头！你知道有多久了？

You sly old devil! How long have you known?

汤姆和露西相恋多久了？

How long have Tom and Lucy been going out together?

没多久便可清楚地看出，这个节目不受欢迎。

It soon became clear that the programme was a failure.

他的心脏对这种压力承受不了多久。

His heart won't stand the strain much longer.

人不睡觉能活多久？

How long can a human being go without sleep?

你看这暴风雨会持续多久？

How long do you think this storm will last?

你在这个国家居住多久啦？

How long have you been living in this country?

不用多久你就会习惯船上生活。

It won't take you long to find your sea legs.

他们在这里愿意住多久就住多久。

They're welcome to stay here as long as they like.

你将在巴黎待多久？

How long will you be staying in Paris?

深吸一口气，看你能在水里待多久。

Take a deep breath and see how long you can stay underwater.